Feed Trico and get out of the hall with the large dome | Walkthrough The Last Guardian Guide
Last update: 15 December 2016
First, you need to find a barrel to feed Trico. Search for a side room, which has to be accessed through a hole in the wall. This area contains two large chests that need to be pushed to the vicinity of the grate. The screenshot above shows how it should be done - place them next to each other.
Now you can go get the barrel. Move it to the chests which have been moved just now, and make a throw so the barrel lands on them (you need to have both chests lined up, otherwise the barrel would land in the area between the chest and the grate). Make a throw such as the one shown on the screenshot. Climb onto the chest, pick-up the barrel, and throw it through the hole. You can now give the barrel to Trico.
Wait until Trico replenishes his health. Climb onto his back, and order him to approach one of the upper holes by the dome. Once Trico reaches his goal, jump to the hole, and come out outside of the building.
Begin moving left on a narrow ledge. Stop in the middle, and start descending to land on the roof marked on the screenshot below.
Turn back, and start moving through the roof of a long, swerving tunnel. Once you reach its ending, descend from the ledge and turn back again. Now proceed using the tunnel to the hall where Trico awaits you. Stay mobile - some suits of armor have been resurrected. You need to reach the barricaded door, and have a window enough to remove the blockade. It will allow Trico to break through the door.
Once Trico breaks through the weakened wall, the whole area will start to crumble. An escape scene will begin. Escape and perform jumps in locations where parts of the floor are missing. At the end, you'll to make a bigger jump. Make the move when the floor has risen, and created a ramp. This will guarantee that Trico will manage to catch the boy in the air, and saves him from falling into an abyss. After a moment, both characters will land on a new, safe rock ledge.